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I'm sorry I'm going to bother you again with the electricity. Does anyone know what the brown wire that goes to terminal 1 of the starter solenoid is for? because it is connected with wire C of the ignition switch which sends the + 12v to the coil and I don't see why 2 + arrives here? or is it that when the ignition switch is in position S (and therefore activates the starter) is there no longer a + on the C? and that ultimately it is the solenoid contactor which will power the coil? If you have the info I would be very happy to know!
Ignition bypass circuit. It bypasses the ballast resistor (wire) to apply full battery voltage to the ignition coil during cranking for better starting.
Oh well that was my other question, what is the resistor on the C of the ignition switch for and where is it located in the truck? On the ignition switch?
It needn't be replaced unless it has failed. You can check it with an ohmmeter (from the ignition switch to the coil). I don't know what the value should be. Anyone?
@ADELEANDRE - If you refer back to your schematic wiring diagram the resistor says this underneath it.
IGNITION RESISTOR WIRE
PART OF MAIN WIRING
The resistor wire is one of the wires in the main wiring harness that runs from the ignition to coil. Good thing is wires don't usually lose resistance much over time, only gain resistance.
True enough. Somewhere (service manual?) I saw some instructions for installing one of these replacement wires. Seems like it said to run the new one next to the harness. Hopefully he won't need one.
Lots of them on eBay for sure. Hard to replace them without unwinding the original harness wrap and replacing the strand and wrapping it back up. That's why the instructions just say to route it next to the original harness. Plus, the replacements are about 3 feet longer than they need to be.
Not an authority, the brown wire possibly offers a link to a circuit if the truck includes an Alt. gauge; If so, there are a few options on on how to run the ALT circuit, suggest research to determent which options best meets your application. On my 65 I removed the ceramic resister and installed a fuse block; although I would imagine one could use both? If the instrument panel does not have the ALT gauge then perhaps one would run the wire to ground????
Posting pic of circuit from 1965 Ford truck wire diagram, may; or may not apply? :
Thank you for this informations. The existing wiring has been removed and I want to completely redo it, so either I cut the pink wire on the old harness to reuse it, or I put something else in... So a new wire or a resistor
